A ministry is a specialised organisation responsible for a sector of government public administration, sometimes led by a minister, but usually[who?] a senior public servant, that can have responsibility for one or more departments, agencies, bureaus, commissions or other smaller executive, advisory, managerial or administrative organisations.Ministries are usually subordinate to the cabinet, and prime minister, president or chancellor. A government will usually have numerous ministries, each with a specialised field of providing public service. National ministries vary greatly between countries, but some common ones include Ministry of Defence, Ministry of Foreign Affairs, Ministry of Finance, and Ministry of Health.